Re: mouse-drag-and-drop-region

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Re: mouse-drag-and-drop-region

From: Stefan Monnier

Subject: Re: mouse-drag-and-drop-region

Date: 2017年11月18日 09:36:40 -0500

User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

>> render buffer text to desired-glyph-matrix
>> combine desired-glyph-matrix with overlay-matrix into combined-matrix
>> send combined-matrix to screen
> If you mean that literally, then the above will disable (almost) all
> redisplay optimizations, and will cause Emacs always to display each
> window in its entirety.
> Redisplay optimizations require that Emacs be
> able to _reason_ about parts of the window display being unchanged, by
> looking at the related objects and variables -- buffers, overlays,
> etc.
The above is the *model*. I'd describe the current model as:
 render buffer text to glyph-matrix
 send glyph-matrix to screen
both models are amenable to various optimizations. Most of the
optimizations applicable to the current model should be applicable to
the other as well.
 Stefan

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